The curvature course during straightening is understood to be the correct sequence of curvatures followed by the process material during the straightening process.
The initial curvature is always followed by the counter-curvature. The final curvature is the curvature remaining after spring back. This curvature sequence is repeated according to the number of straightening rolls.
A straightening process should be arranged so that, irrespective of the initial curvature, the last adjustment-induced curvature resulting after the last spring back in a final curvature corresponds to the desired straightening result.
See Also
Adapted from “"We do it straight" — Wire Straightening”, p. 59 (ISBN 3-00-005897-4).